pipe wrench. The expression "throw a monkey wrench" into something generally means to sabotage something or to cause a problem or delay in performing repairs. Also see left-handed monkey wrench.

(term first documented in early 19th Century British machine tool industry pattern books -- used primarily for smooth jaw wrenches with a screw or knurl adjust on or parallel to the main handle.)

adjustable wrench that has one fixed and one adjustable jaw

a pipe wrench, a wrench with an adjustable jaw

A wrench capable of being adjusted so as to fit nuts of different sizes.

A flat-jawed wrench that has one movable jaw, which is adjusted by a screw so, it is able to fit various sizes of nut.

For other uses of this term, see Monkey wrench (disambiguation).

"Monkey Wrench" is the first single off the second Foo Fighters album The Colour and the Shape. It was released mainly on two different versions in 1997.